#! /usr/bin/env python3

import youtube_dl
import json
import ffmpeg

jsonFileName = "clips.json"

clipDict = {}
with open(jsonFileName) as jf:
	clipDict = json.load(jf)

ydl_opts = {"outtmpl": "%(id)s"}

for clip in clipDict:
	infoDict = None
	with youtube_dl.YoutubeDL(ydl_opts) as ydl:
		infoDict = ydl.extract_info(clip['source'], download=False)
		ydl.download([clip['source']])
	
	if infoDict is not None:
		stream = ffmpeg.input(
			infoDict['webpage_url_basename']+"."+infoDict['ext'], 
			ss=clip['from'], 
			to=clip['to'], 
		)
		stream = ffmpeg.filter(stream, "scale", height="480", width="-2" )
		stream = ffmpeg.output(stream, clip['target'], vcodec='vp9', **{"an":None, "y":None})
		ffmpeg.run(stream)